In draw, you use background to clear the display, and then calculate the direction cosines for the orientation of the cannon.
在绘图中,您可以使用background来清除显示,然后计算发射方向的余弦值。
In draw, you use background to clear the display, and then calculate the direction cosines for the orientation of the cannon.
在绘图中,您可以使用background来清除显示,然后计算发射方向的余弦值。
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